This is great advice, and is absolutely what I'd do in this situation myself. I generally avoid in-place upgrades unless there is absolutely no choice for some reason. If you can build a new server on the OS you want, you'll have a lot less pain just moving your content, services, applications etc. across from the old server to the new server and then just updating your DNS to use the new box. Of course if you only have one server and cannot get another then you don't have much choice, so it all depends on your circumstances really.